Well established for whom? For many poor Americans, the thought of resisting a local PD seems impossible, let alone a federal agent who comes knocking. Try to imagine being on your night shift at a rural Motel 6 when a few strange individuals start waving badges, making requests, maybe threatening to escalate things if you don't play along. Maybe you would have the courage to stand up to them, but I think a lot of people would fall to the pressure and abide by the request. One big difference is privilege.
I believe ICE should be responsible for illegally attaining this information. They should also bear the cost of educating the Motel 6 workforce on their rights to resist requests from law enforcement agencies.